While demanding to have a lower price is rather needy and also insulting to the hard work put into the game, I do also get the point. There is tons of free stuff around, so the average price of indie games is rather low.
For those people a simple line in the description might do, that the price is basically a one time payment instead of subscribing for one month on patreon.
As for me, a demo version would be good for customers like me. I do not know your stuff and not having a demo version discourages me from buying, because I wonder why this is so. This is not Steam where I can read tons of reviews and can give back a game shortly after purchase, if I have buyers remorse.